Other mountains could be considered Earth's tallest; it just depends how you measure them.
The omicron variant of SARS-CoV-2 may be less efficient at infiltrating the lungs and spreading from cell to cell, early lab studies suggest.
Some stars don't have planets orbiting them. Here's why.
An international partnership of space agencies just launched JWST, the biggest, most powerful space telescope ever made, in an achievement that was decades in the making.